Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6402bf0fc5a7b…

MALICIOUS

PDF

67.6 KB Created: 2020-12-19 09:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fcb365f0554cbe8a53d416a7487c37ee SHA-1: bdf4da71711da18cdd837e13b8fce35263af43a5 SHA-256: aaf6402bf0fc5a7b9a31ae5ab30c6417ca1064e2bb999196c13283863718f845
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=parasite+real+screenplay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fd3888d83b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5fa257ea36ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fb5870e70607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fb2924b02225.pdfIn PDF document text
    • https://saxoxukodumixab.weebly.com/uploads/1/3/4/6/134635675/785a2b67.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/sikagivuv.pdfIn PDF document text
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/jafose.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/9809992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f97c7558129a.pdfIn PDF document text
    • https://dewebunofimob.weebly.com/uploads/1/3/3/9/133986907/30a7f7520d02a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f97d64a6e411.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/mibaxipuveredurelip.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/mafizodumamapefuri.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/fejekirepuvipa-vopixugi-nugadifuvete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kakef/department_of_biomedical_informatics_osu.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/rainmate_il_scents.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 5028 bytes
SHA-256: 5c3e7b5e9f9f084f986a13a6f3648a84770babfcd7745f770507079b3e4e8ddb
font_01_sfnt_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 9956 bytes
SHA-256: 2db82326aef47e62b79e5bc53a1ca1abcc427a9ca4b90e628597159576b01d55

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